Abu'l Ghazi Sultan Alqas Mirza Safavi - Gov. of Astarabad - Shirvan and Darband

also see: https://www.academia.edu/3884811/Rebels_and_Renegades_on_Ottoman-Ir...

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[... In 1530, he (Tahmasp I) sent an expeditionto Širvān, ruled by the autonomous dynasty of the Širvānšāh, with the aim of avenging the killing of his grandfather,Ḥaydar, and converting its Sunni population. Having subdued the province, he placed it under the command of his brother, Alqāṣ Mirzā.When Alqāṣ Mirzā rebelled in 1546, Ṭahmāsp sent a further campaign to dislodge him, until, in 1547 Alqāṣ Mirzā fled to Istanbul to make common cause with the Ottomans.] ref https://www.academia.edu/3640285/Safavid_Dynasty_Encyclopaedia_Iranica

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Abu'l Ghazi Sultan Alqas Mirza (Persian: ابوالقاسم قاضی سلطان آل قصبه میرزا‎‎), better known as Alqas Mirza (آل قصبه میرزا; b. 15 March 1516 - d. 9 April 1550), was a Safavid prince and the second son of king (shah) Ismail I (r. 1501–1524). In early 1546, with Ottoman help, he staged a revolt against his brother Tahmasp I (r. 1524–1576), who was king at the time.

Of the four sons that survived of Ismail I, Alqas was the second one. Sam Mirza was probably his full brother, while Bahram Mirza and (the future king) Tahmasp were brothers born by other mothers. In 1532/33, he was given the governorship of Astarabad, while Badr Khan Ustajlu was made his regent (lala). In March 1538 Tahmasp I (by that time king) ordered Alqas with his regent to move against the rebel Shirvanshah, and six months later he was appointed governor of Shirvan, where he remained for the next eight years. During the frequent Caucasian campaigns under Tahmasp's tenure, Alqas was defeated by the Circassians, and was appointed governor of Derbent (Darband) afterwards. He started to openly revolt there, which included minting his own coins. Upon hearing of this, Tahmasp, at that time in a winter campaign in Georgia, started to march upon Derbent. Alqas subsequently fled Derbent, to Crimea, while by early 1547, Tahmasp had already re-taken Derbent.

As Crimea passed into Ottoman hands at that time, Alqas moved to Istanbul by sea, arriving there towards the end of summer 1547.

At Istanbul, he contacted the Ottoman sultan Suleiman, explaining his reason of departure from Iran, as well as his desire to return there as an Ottoman client. Upon hearing this, Suleiman hastily moved from Edirne to meet the exiled Alqas, who promised strong Qizilbash support if Suleiman might help him, and he may have converted to Sunnism.